[問題] 流體力學白努力定律推導
請問重力加速度在流管側面的投影為何是-g(sin(sita)),不是應該乘的是sec嗎?
http://i.imgur.com/HgLbE0J.jpg
![](https://i.imgur.com/HgLbE0J.jpg)
![](https://i.imgur.com/ojkZuH1.jpg)
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